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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '108937856c8416c63659ae0a06018770ca6f41c0e5a6a78f4ef248c3180bcb41' 
  AND token = 'Y24la2kp4iRouM3sOl9e7ZjibdLDYifD/TlEIL5e3gM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}